Automatic meander extraction method

An automatic extraction and meandering technology, applied in the application field of geographic information technology, can solve the problems of low degree of automation and achieve the effect of good extraction effect, consistent results and high execution efficiency

Inactive Publication Date: 2018-07-24
INST OF SOIL SCI CHINESE ACAD OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the research on the morphology of meanders, the degree of automation is relatively low, such as the extraction, classification and measurement of meander parameters, and manual or semi-automatic

Method used

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  • Automatic meander extraction method

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Embodiment Construction

[0045] The technical scheme of the present invention is described in detail below, as figure 1 As shown, this embodiment specifically includes steps:

[0046] Step 1: Read a vector river line layer data whose interval is [start, end], extract a meander neck element and the corresponding meander element based on the shortest weighted distance, and determine the starting point position of the meander interval, which is recorded as [ neckStart,neckEnd]; start and end are the starting point and end point of the extraction interval.

[0047] Among them, the experimental data of this example adopts the 1:500000 Jialing River local line layer data generated by digitization of remote sensing images in Google Earth ( figure 2 ).

[0048] Step 1 specifically includes the following steps:

[0049] (1-1) read a little quantity is n, interval is the vector river line layer data of [start, end], and write collection L; In the present embodiment, n is 497;

[0050] (1-2) setting i=start...

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Abstract

The invention discloses an automatic meander extraction method. The method comprises the steps that (1) vector river line layer data in the interval of [start, end] are read; a meander neck element and a corresponding meander element are extracted based on the shortest weighted distance; the position of the beginning of the meander interval is determined and denoted as [neckStart, neckEnd]; (2) the middle data of the interval [neckStart, neckEnd] are removed from the data interval [start, end], and sub-interval dividing is carried out; (3) the step (1) to the step (2) are iterated until all meanders and meander neck elements thereof are extracted; and (4) parts conforming to user-specified thresholds are extracted from the meanders and meander neck elements acquired in the step (3) to generate a meander line layer and a meander neck line layer. The automatic meander extraction method provided by the invention has the advantages of high execution efficiency and high accuracy.

Description

technical field [0001] The invention relates to the application field of geographic information technology, in particular to a method for automatically extracting meanders based on vector linear river data. Background technique [0002] The study of river morphology can provide geomorphological basis for the protection of river landscape environment and the development of hydraulic resources. The geometric parameters of modern rivers are very important for the reconstruction of ancient hydrology and the evolution of rivers. Among them, the planar shape of the river meander is the main content of the river type research, and there is a close relationship with the horizontal and vertical changes that restrict each other. [0003] At present, great progress has been made in the study of free meander morphology and discriminant parameters. However, in the research on the morphology of meanders, the extraction and classification of meanders and the measurement of meander paramet...

Claims

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Application Information

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IPC IPC(8): G06K9/00
CPCG06V20/182
Inventor 解宪丽李安波万夏
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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